The Color vs Luminosity Blend Mode in Photoshop
Today's tutorial is not about all of the blend modes, but two very distinct ones, Color and Luminosity. While they both do opposites to your image, they are related in many ways. Let's take a Curves Adjustment for example. Modify a curve set to RGB, with a blend mode of Normal, and your result will be a tweak to the Tone and Color of all the underlying data. However, if you switch that blend mode to Color, it will strip the tonal data from it and if you decide to go with Luminosity, it will remove the Color data.
With these blend modes, you can protect the tones or colors in your image and have more predictable results every time you use them. Here is what Adobe says about the Color and Luminosity Blend Modes:
Creates a result color with the luminance of the base color and the hue and saturation of the blend color.
Creates a result color with the hue and saturation of the base color and the luminance of the blend color.
By description, they are the exact opposite, but these descriptions don't do us a favor regarding understanding them either. In layman's terms:
The Color Blend Mode will apply the selected layers colors to the underlying layers but allow the tones of those layers to show through.
The Luminosity Blend Mode will use the selected layers tones to the underlying layers without altering the underlying layers colors.
Text, image and video via f64 Academy